LC Guidelines:  Tracings and References - General Information - 4XX Fields

NACO:

Subfield Codes

Do not use subfield $i or subfield $w code r in 4XX fields.

$w - Control subfield in 4XX See From Tracing fields

____/0  Special relationship

Use code n (Not applicable) when a subsequent character position in subfield $w is coded.  In other respects NACO participants should follow the guidelines in the LC usage section for this subfield.

 

____/1  Tracing use restriction

Use code n (Not applicable) when a subsequent character position in subfield $w is coded.  In other respects NACO participants should follow the guidelines in the LC usage section for this subfield.

 

____/2  Earlier form of heading

Use code n (Not applicable) when neither code a nor code e applies and a subsequent character position in subfield $w is coded.  In other respects NACO participants should follow the guidelines in the LC usage section for this subfield.

 

____/3  Reference display

Code n (Not applicable) allows the generation of a cross reference display and need not be coded in subfield $w/3.  In other respects NACO participants should follow the guidelines in the LC usage section for this subfield.

 

SACO:

SACO participants should follow the LC Subject usage guidelines that follow.


LC:

Subfield Codes

Do not use subfield $i or subfield $w code r in 4XX fields.

NAMES/SERIES:

$w - Control subfield in 4XX See From Tracing fields

____/0  Special relationship

Do not use the following codes:

a - Earlier heading

g - Broader term

b - Later heading

h - Narrower term

d - Acronym

i  - Reference instruction phrase in subfield $i

f  - Musical composition

r  - Relationship information

 

t  - Immediate parent body

Code d may occur in LC records created before 1981.

 

____/1  Tracing use restriction

Do not use the following codes:

a - Name reference structure only

e - Name and series reference structures

b - Subject reference structure only

f  - Subject and series reference structures

c - Series reference structure only

g - Name, subject, and series reference structures

d - Name and subject reference structures

 

 

____/2  Earlier form of heading

Do not use the following code:  o - Earlier established form of heading (other authority file)

Use code a (Pre-AACR 2 form of heading (national name authority file)) when the tracing is for a linking reference from a pre-AACR 2 heading.

Use code e (Earlier established form of heading (national authority file)) in the LC/NAF primarily when a reference from the former heading is appropriate under normal AACR 2 reference practice, and the former heading is not covered by code a.  This includes former headings where code c (AACR 2) or code d (Non-AACR 2 form used with AACR 2) were used.  Do not automatically make a reference from the former heading in order to supply code e.

The following obsolete codes may appear in LC records created before the adoption of AACR 2 in January 1981 until these records have been evaluated (008/29, Reference evaluation is changed to code a) and the authority record updated.

b - AACR 1 [OBSOLETE]

c - AACR 2 [OBSOLETE]

d - Non-AACR 2 form used with AACR 2 [OBSOLETE]

 

____/3  Reference display

Do not use the following codes:

b - Reference not displayed, field 664 used

c - Reference not displayed, field 663 or 360 used

d - Reference not displayed, field 665 used

LC has not actively supplied field 664 or 665 since the 1980's; if these fields or code d or b are found in 4XXs, upgrade the NAR to the current practice.  Use code a (Reference not displayed) when appropriate for suppressing a cross reference display.

 

SUBJECTS:

Subfield Codes

$w - Control subfield in 4XX See From Tracing fields

____/0  Special relationship

Use code n (Not applicable) in this position.

 

____/1  Tracing use restriction

Use code n (Not applicable) in this position.

 

____/2  Earlier form of heading

Use code e (Earlier established form of heading (national authority file), or code n (Not applicable) in this position.

 

____/3  Reference display

Use code n (Not applicable) in this position.

 

For more information on LC Guidelines, select:

Introduction  (LC Guidelines)

See also:

LC Guidelines

MARC 21 Format for Authority Data:  Contents